- 'Schrader, Paul' wrote the original script. When Steven Spielberg, changed a great deal of it, Schrader decided to remove his credit. Since the film couldn't be left with no credit for writing, Spielberg claimed it for himself.
- The working title was "Watch the Skies", the closing words from Thing From Another World, The (1951). These words also can be heard in the cartoon that wakes Neary.
- Barry is shown to be surprised by the extraterrestrials. Director Steven Spielberg had two crewmembers hide in boxes off camera, one in a clown suit and one in a gorilla suit. One popped out, then the other as the cameras rolled, catching young Cary Guffey's bewildered reaction. Spielberg then whispered to the "gorilla" to remove his mask, eliciting a smile from Guffey.
- SFX man Douglas Trumbull created the cloud effects by injecting white paint into tanks of salt and fresh water.
- It is possible to see an upside down R2-D2 (from Star Wars (1977), etc) in part of the large spacecraft that flies over Devil's Mountain. The SFX people needed more detail, and so supposedly there are many more such items, such as a shark from Jaws (1975) (also directed by Spielberg), etc. R2-D2 is visible as Jillian first sees the mothership up close from her hiding place in the rocks.
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